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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abefd54a37e739559a2d38cd3e63adef8c63a9b4fed8e0c0048d83356ef2524' 
  AND token = 'oMlwpbrb9cF6nacX1rUG2H1aSPyBSWD2wlH2isjiVqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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