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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b07c6021fb569ae85de9be31b3f690ccf7929b396d35dc0b4c61c6aafb4412' 
  AND token = 'hfG0j/sIgyzR7iAP2Jy9Z9a+8R3zVcpNQZgZvGiemzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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