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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd23391a3dd828c88273e135fae42e60df7fe8e00d8c9b9077b08ff86cd4d1bc' 
  AND token = 'iHxf3LLm7F62oFfqBLi5rqJ561vfpe79GsnR5Wr5UuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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