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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcd47edbf3a8744f16bc2249f491f1e8f56e19c93bdfce10af8075bdbc57ffb' 
  AND token = 'Pejtd0Sxb8d+ID4VM1A9YSHKlfIbSw0uCsx12fSnh90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}