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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb97e2ce4bbe3617748215b3c036a35a443fdcda91977b69903f4daac6c6bc7d' 
  AND token = 'eiAFYYmwDzYx8Atjs/GJduu12uYeE/Z7w/dhJqTY/S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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