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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b198ccfa4db9c55fafd6f7a1359eca33052b30138c2d033b07afbaba115527' 
  AND token = '3D6kizokLDZCHCdHa90COYom8eVv5et7kkk9Pz99lZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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