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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84371e5e1d8b83cebc2f8bd1744ac1816846a972144e1b74a46b7c6792c343e3' 
  AND token = 'sgmsAecFj7I12HIsWYl8lV1fW5xME9CAj1B2XU1Un/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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