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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69eca5e0f9469e28e1f82c5c06665600a6129b498cd82f2eaeb03737b3ab2976' 
  AND token = 'ZrLDNgGcpgQs/LAtoeabC6x6/YfiVyDdG0vnzfRvCO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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