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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2a7d2aca6db61e89af47bc53cb5ee99e4cffadb6eaa47e254bd75684f0b5dd' 
  AND token = 'MIMza6aXDea69zvJdyf/2wyJhwa/DQynRMn6r7EypYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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