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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206cd43e8e7e04980e2f9984ce54b35e3589e6864da24b17277fdc892137037c' 
  AND token = 'mHbjlPfYk+E2TMxzT8kylpHmq3ncT7PBXM1PIlc/U+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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