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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6859e23a1eaaf0aa0acaece4a4bc7f65558d2c2e59907748c04c5edc26ee4a9' 
  AND token = 'qOcqNoRxcjYQC/l3dKsv1bOilqkHuriPvG57+NSsFvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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