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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ef5487d951255ff191ad81063e37ef6742e6a2498b3f137f9d50080647d393' 
  AND token = 'f6gAi0aIixP4IiWCCmON2Emp5jPLnPKci3mEaiTlf4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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