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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599da0fd38f3deea37f559e676eac6dac81f96c7c4ef7603f7f2ae84c542e321' 
  AND token = '1iSRhba1Zmth/0zhD7mR72fetnLjaLZHuz+eVnQRcl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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