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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1474a882eb627a2d3dd3e05205849da5673a1ff5f041ea931a20c88e50a1a8f' 
  AND token = '5NcMpM8Z84IME+7iKvCRcmntSvJJvbU19wPR8zX/ozM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00240

JSON explain

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