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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbef4c8209e3bdc5dc6b96f48ea55e3eee959d09450b2b37928e85ab97b6a93' 
  AND token = 'INDAsK9yQSV+tSmPZ1JNF0R5LYLh6xFviy+J26vta7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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