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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1625652e2dc5a6ff1a600dc8243f76c6c16502d03e69a6edecfa2a6a14c577' 
  AND token = 'nfpswxDtBqb6w3tqTHm3iclQqYTms6DDdKbJueK2HB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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