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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20e4b1285bf9de2c9a3a06f65e45f7b1df5d732f08ade5fdd9440d577ea1389' 
  AND token = 's++YbFYDpgyKotsVeW8W+Cs7W57RXuMGF6X7so8YPxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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