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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f08f6eac2b687acd489644a8646838f8c9b7c733ead8d96e26c07c97684f51' 
  AND token = 'RMCzlNtfP5JRKDOTZje5u3FSF28inlxAm/4txeCJ9yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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