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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34545a7ba15dd26866e58314a383adc273d7e4ea5624e20e8b3f0adcadd96398' 
  AND token = 'ynuJHwYUludDtE9J2g88QYNFeJS8F6zOiOCcG2Stcqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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