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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a06aed84ce7623a82af9cd20466fccfdfc0833bd50f22673b225771a7b7016' 
  AND token = 'HphfGMLmCTDSfFOYp3hILI+O8Yeyh0HlfUb/afw74VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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