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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81ddd6ad07d314a7d15670348f3760376fd10434a397c34799c488342986fd4' 
  AND token = 'zFM+PLGykkEp129vx4ZacRmc/LdCXwbzlDLuzUROPQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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