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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03fbf47cb63362661a3e99288eecbd0e78ba793be9b222635a22dc4cc4bd4d6' 
  AND token = 'nDAxHlA4XlfotDUlY2BMNA/ewLsd3RJU4RB1j9kRa3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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