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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bb832bbedb6aaf8458caa203d7b2aa1c17e2e9e58b8185e744f5605a30b795' 
  AND token = 'h4rIUX4BC5rr4wLqpePq4zDqCQUjp9IjejqzBmSPbBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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