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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd29b7ab2bbef9569dc202e99733702d3041c08a3756c27de58a7c1dc8c3896c' 
  AND token = 'Vrm9poZ+cLzi/VBYvuFPxwEIUF70i33RS0XEb+CIcH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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