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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8139847b5b4324c159cb16abf785484eec2c634a850a8d059c36943731dbb9ce' 
  AND token = 'sSlPHT4GU7TSWYJHueRKj7TU5yRNQ9KWEL+FYuGRrmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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