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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d9073d8c7e951241f39a548dadfd40408635780b1f6e9a0c261b557d852ab8' 
  AND token = 'DZsu10KxSDV3a+wHjOSiTK2e1qUw2Hb/fBn8si0tFv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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