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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c992d49b5839d22c7fcec71ea195a744334b8763e0f07fa32a5b70be4f7c294c' 
  AND token = 'OVcOO93i4FPbKyDf8aUs3xO6pnVLas+/6zv2BLCgwkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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