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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5bf44c735526dcdca297e6533616e113d24edd02c3c9f7927113dae33a3521' 
  AND token = '6pdLjgu8c/M8IK1He7vlCvKOKVAiVjixM2ksFhZiIXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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