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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c858129c190ba12705e456c2d591bf1679efa8565354d7016ae5b96fff72148a' 
  AND token = 'F0b6nGv+nKk9rbLakoGlF60I4LjljojZqZH6+VVdtQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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