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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47966d7266dc92122cef14f069991867595248b0ad8a7f80fe80cf51b3203028' 
  AND token = 'gVzZX0BMJ/i15mtBRQJfqVEMrgZRrGDA1ZJ7+er98Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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