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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2065518ad5a6068f824289bb912184f0d5abd0d43928ca90470f851134e4f705' 
  AND token = 'dsjMRD4Y2XnZcnh5zflACbzZycaRwPNakWYItqButfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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