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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab19dd251ae90fe16d60ae53b3524c04d2a65bd86bdca07f1b7d8b247ddb9eb' 
  AND token = '7JpabaPZ0uei9b/mCMuR7MoRJz+fZ4y3ikD2J3qCM84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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