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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbf444d6fa2a569f3f9b498b0d318b3d92fb4a4e1a1b6a19e957719a03de72b' 
  AND token = 't1sK/J9KxTLxAseu86tPweIjxcpMJwzWmJPogNKUKpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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