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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c224b8a9c61bf3c957ce1c6b4347759820a6a0296318cf710099ca8211b966' 
  AND token = 'LHAQu5dU01FFu+bUwQY8a8B+7rXAL9norLB8fL57dhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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