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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a16c6906b0984886ca5ec49e9e3e33bfe1e0a707ac0c5aa05da6e9c7d7c5d6' 
  AND token = '9EOhspF1Ys4t3MWgvAnIy7ro2hPM2ilfR0wjhAU5fKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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