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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72bd380e998301d3a520731bf9c9044dcb9b2882e98a7e938a8fec0bfbf1021' 
  AND token = '/02GqhC57J+Z93v80A1aP/RnI+4yhLqA6gPdp9mBhuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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