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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ebcef0331d3f990e90d9287e863c66c90096e85e41c9607b2e7f6768603dfb' 
  AND token = 'MUG/A8W14b+uzNPo4dA+GJg4S0AKDu9a+TEO2NRXlGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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