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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10ce37ed5a59d9d9a8396b97b47d93fb78b66bf1b9d5813d6a9fd5328d84265' 
  AND token = 'fnv2Uu0Qu4N8g1Q22DQ7k3bdXy42/ya9K6UrXYswgfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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