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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3b82744022eaa456129ee3b148d79f5773709a51dc4f3ef71df415a73495e5' 
  AND token = 'geAa4Pq29RluStzBTyprP60fYUMSKX2zRFHRLVroPx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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