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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c339acc46a8d994d52f9df75b5be13ef554fb3a50999188163fd78d0ebff526' 
  AND token = 'E/Ay4Rfs9f8Fdf/YAzKocKtKTaNhlrblbeoqOvFH6Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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