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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca9d8524cbf4c6a303f5eeb2015104a0062d3674a4c47082b131f4b58bf265d' 
  AND token = '310F/xz/LDwtdkYnbB8yq0vuIP/syYVrXf8OFhipKBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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