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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795fb7c89a4ce8554f2f7cbed3d2ab912940f26672344e26374bc25f175f654e' 
  AND token = '+z12i9S5scYNheIL40ZNcBOPU3bF9ZnB79wymnlBjqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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