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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879d677bace5552c85699a7a641536824cfe6868fe7ad843e79e76310d185137' 
  AND token = 'b9Ws2UxOJXXMnFNJ78PD5REqjCj0Tsj00RopqxHIcRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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