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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4844b345faef2c6fdc027c4e1d0f141543627d68c7142baf70ea303962f46506' 
  AND token = 'YsnT/Iz6yLICd0ZtIfv+E+Dk3QIEDYuHgpf7eKB/dXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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