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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a503254a9c8bc4aa2ffdd48ecdd05bd3e880b2c79336b0755cc89ef806bac22' 
  AND token = 'RgNNaRmqH5Poh6GG6orIBSgQ4fAT6Rmtj7L+FLUmr1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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