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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd867c4aefdd54a9b48d4013214d471ecf552da56a11a83815d887000084e7d39' 
  AND token = 'iWL9e0C+cSvfOtjyV7sGf7nCsfZ12yeGdpTC5uFDp9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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