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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5b28d5ad538b6dcc8f56bb3a350ae145a8791b3d253642306da984bcca7f1e' 
  AND token = '5y5Qec4Msf/srBXzo0kgr0WB1/HxtWbruDZHwDJKFOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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