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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f5ef096545150526146623d54428f391bf7e980079ac0ed95ca30458f40cb3' 
  AND token = 'RJ5YOsk7LTbamm09YLFeIYtNx/pDu0fLf+GwdwluCZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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