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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3997dde0fe87229b49a5c0b2e5d1cd0cf5ed1d86b2bba1c418560aece5fe357d' 
  AND token = 'McpVeqGYOQ5ltR1cNE1MCpXvDkvAc+7IqnQzu14bgRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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