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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5b48ef6d141c0f7cd6fa65de28bf08ff33c25b7c04753a572aaf4bbd6ce08a' 
  AND token = 'O7bLc4ncC9jI6i0m3awa/ZgjhpY4SeY075F6c8ttaOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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