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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce71a46608515a5db3d8c774d997476513ab4197f98f766f2162d583521338e2' 
  AND token = 'D4YfoDvWn/EbT69vcXFPwO/msA/8VNnIC5XQ6ux4UEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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