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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ff9c9e6745177c74f4d3f698ac09b5af87057bb77c3c3e4e8d4e17ebebacc2' 
  AND token = 'zG7HQerxRJZ/g0cUZ4mclM0wYcx8NPHsi3Z2P+PHY2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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