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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4fc877800cdad1584d6ab2e6bdcc278283e2c60f422c589be7188edceaf0db' 
  AND token = 'iTnCazn9DfII2g86qhGUuhNxd98R0fRURpEx0USY+Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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