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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f78f87f273673ab8c1f8d68528bc2534f735f9431f6a30795621b428c1dfaa' 
  AND token = '9h8AcoouSjzyIO1LllxgPGsGa/kGdFkSSTjk62giCdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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