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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbb94e28f7f06ebfac267b083b2669863c2c3b7382ec0a21af7f63feefac936' 
  AND token = 'VG7IsYM7EcIVqh/kzfSIwr06SS9bD7vJ41K/rKwxu14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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