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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120e9a4402f129e0ffc6b234ca59fa358a6bafa41b253e3f0ef8888765d79074' 
  AND token = 'GqHP8iWow/E6DbeciRBYJ0eqaM3ZiLTW6pwUay8A80E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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