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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414e6d60f054d7810fb2c7ebf8a4481ae5ef1d0a2a89159dcd669829a01bf0c6' 
  AND token = 'GEbvk3Lh7v2Tf9mjTWaPLMK5fBbArOkow1f6ANV9Hlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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