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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8732430fc379425a37cddbdef7b6dd576f56287cd6665a77216a4ecd2e25b6a5' 
  AND token = 'i/8wtdKn57jSW1dLiURjahq9TAnbC5cz3fjrffrXkrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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